Screw driver bit



FIG. 1 is a top, front and one side perspective view of the screw driver bit showing my new design, the opposite side being identical to the one shown;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a screw driver bit, as shown and described. 